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CVE-2026-8078 Checkmk GmbH CVE debrief

CVE-2026-8078 is a MEDIUM severity vulnerability in Checkmk versions <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions. An administrator can store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.

Vendor
Checkmk GmbH
Product
Checkmk
CVSS
MEDIUM 4.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-06-08
Advisory published
2026-06-08
Advisory updated
2026-06-08

Who should care

Users of Checkmk versions <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions.

Technical summary

Stored cross-site scripting in the global settings change log in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Checkmk version 2.5.0p5 or later, 2.4.0p31 or later, or 2.3.0p48 or later.
  • Apply the vendor advisory: Checkmk Werk 17992 (resourceLinkAnnotations: ref-4)

Evidence notes

CVE-2026-8078 was published on 2026-06-08T13:16:33.760Z and modified on 2026-06-08T15:53:41.557Z. The CVSS score is 4.8 (MEDIUM).

Official resources

public